CN116447057A - Dual-fuel electric control injector and control method - Google Patents

Dual-fuel electric control injector and control method Download PDF

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Publication number
CN116447057A
CN116447057A CN202310576236.9A CN202310576236A CN116447057A CN 116447057 A CN116447057 A CN 116447057A CN 202310576236 A CN202310576236 A CN 202310576236A CN 116447057 A CN116447057 A CN 116447057A
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CN
China
Prior art keywords
valve
valve block
layer
needle valve
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310576236.9A
Other languages
Chinese (zh)
Inventor
于奇松
李俊鹏
徐文
罗辉
周茜
罗钧壤
杨淼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CSSC Marine Power Zhenjiang Co Ltd
Original Assignee
CSSC Marine Power Zhenjiang Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CSSC Marine Power Zhenjiang Co Ltd filed Critical CSSC Marine Power Zhenjiang Co Ltd
Priority to CN202310576236.9A priority Critical patent/CN116447057A/en
Publication of CN116447057A publication Critical patent/CN116447057A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention discloses a dual-fuel electric control injector and a control method thereof. The high-pressure fuel oil and the fuel gas respectively enter a fuel oil pressure accumulation cavity and a fuel gas pressure accumulation cavity of the first layer valve block, the double needle valve assembly is embedded into the injection valve block, the lower end of the double needle valve assembly penetrates through the lower cavity of the injection valve block and abuts against the inner side surface of the conical bottom of the lower cavity of the injection valve block, and a plurality of inner spray holes and a plurality of outer spray holes are respectively communicated with the lower cavity of the injection valve block. The upper electromagnetic valve assembly and the lower electromagnetic valve assembly are respectively arranged in the third, fourth and fifth layers of valve blocks, and the control oil circuit and the control gas circuit are respectively arranged in two sides of the layers of valve blocks. The control method comprises two modes of single fuel injection and dual fuel. The invention has compact structure, realizes two injection modes of single fuel injection or fuel-gas dual-fuel injection, and improves the economic performance and the emission performance of the engine.

Description

Dual-fuel electric control injector and control method
Technical Field
The invention relates to an electric control injector of a diesel engine, in particular to an electric control injector capable of being used for dual-fuel injection and a control method, and belongs to the technical field of dual-fuel engines.
Background
With the development of technology, the development of diesel engines faces serious challenges, and the development of diesel engines has a trend of higher performance and lower pollutant emission. In order to improve the performance of the diesel engine, reduce the fuel consumption and simultaneously reduce the particulate matters, carbon monoxide and other harmful substances in the exhaust gas, a proper alternative fuel needs to be selected.
The natural gas fuel is used as renewable energy, has the advantages of safety, reliability, cleanness, environmental protection, low price and the like, and the emission of particulates in the exhaust emission of the dual-fuel engine adopting the combination of natural gas and diesel is obviously reduced, so that the overall dynamic property and the economical efficiency of the dual-fuel engine are effectively improved. At present, a structure mode of sleeving a fuel gas injection valve outside a diesel fuel injector is often adopted to realize the effect of simultaneously injecting fuel and fuel gas in a cylinder, but the structure increases the radial size of the injector and increases the processing difficulty and cost. Therefore, there is a need for a dual fuel injector that does not increase the radial dimension, thereby achieving flexible and accurate injection of dual fuels of single fuel and fuel gas, further improving the overall power and economy of the dual fuel engine, and simultaneously reducing pollutant emissions.
Disclosure of Invention
The invention aims to provide a dual-fuel electric control injector capable of flexibly switching between a single fuel injection mode and a dual-fuel injection mode and a control method.
The invention is realized by the following technical scheme:
the double-fuel electric control injector comprises an upper cover cap, a lower shell and a plurality of layers of valve blocks, as well as an upper electromagnetic valve assembly, a lower electromagnetic valve assembly, a double-needle valve assembly, a control oil way and a control gas way, wherein the plurality of layers of valve blocks comprise a first layer of valve block, a second layer of valve block, a third layer of valve block, a fourth layer of valve block, a fifth layer of valve block, a sixth layer of valve block and an injection valve block, the upper end and the lower end of the first layer of valve block are respectively in threaded connection with the lower end of the upper cover cap and the upper end of the lower shell, the top end of the first layer of valve block is abutted against the bottom surface of a threaded hole of the upper cover, and the first layer of valve block, the second layer of valve block, the third layer of valve block, the fourth layer of valve block, the fifth layer of valve block, the sixth layer of valve block and the injection valve block which are abutted against each other are sequentially embedded in the lower shell from top to bottom, and are in clearance fit with the lower shell, and a conical head at the lower end of the injection valve block penetrates out of the lower end of the lower shell; the first-layer valve block is provided with a fuel oil pressure accumulation cavity and a fuel gas pressure accumulation cavity which are arranged side by side and open at the top, high-pressure fuel oil with the oil pressure of 16-22 Mpa enters the fuel oil pressure accumulation cavity of the first-layer valve block through a high-pressure fuel oil input joint and a high-pressure fuel oil input hole at one side of the top end of the upper fastening cap, and high-pressure fuel gas with the air pressure of 12-15 Mpa enters the fuel gas pressure accumulation cavity of the first-layer valve block through a high-pressure fuel oil input joint and a high-pressure fuel gas input hole at the other side of the top end of the upper fastening cap respectively; the lower end of the double needle valve component passes through the lower cavity of the injection valve block, is propped against the inner side surface of the conical bottom of the lower cavity of the injection valve block, and seals a plurality of inner spray holes and a plurality of outer spray holes of the conical head at the lower end of the injection valve block, and the plurality of inner spray holes and the plurality of outer spray holes are respectively communicated with the lower cavity of the injection valve block; the bottom of the fuel oil pressure accumulation cavity is communicated with a transverse hole at the outer side of the double needle valve assembly through a high-pressure fuel hole which sequentially passes through the first layer valve block to one side of the seven layers of valve blocks from top to bottom; the bottom of the fuel gas pressure accumulation cavity is communicated with the lower cavity of the injection valve block through high-pressure fuel holes which sequentially penetrate through the first layer valve block to the other side of the seven layers of valve blocks from top to bottom; the upper electromagnetic valve component is arranged in the third layer valve block and the fourth layer valve block, and the lower electromagnetic valve component is arranged in the fourth layer valve block and the fifth layer valve block; the control oil path is arranged in the sixth-layer valve block and the injection valve block, and the control oil path is arranged in one side of the seven-layer valve blocks from the first-layer valve block to the injection valve block.
The object of the present invention can be further achieved by the following technical means.
Further, the second layer valve block top surface, the third layer valve block top surface, the fourth layer valve block top surface, the fifth layer valve block top surface, the sixth layer valve block top surface, and the nozzle valve block top surface are respectively embedded with sealing rings.
Further, the upper electromagnetic valve assembly and the lower electromagnetic valve assembly are arranged in the same vertical symmetry way, the upper electromagnetic valve assembly comprises an upper electromagnet, an upper armature, an upper valve core and an upper valve core reset spring, the lower electromagnetic valve assembly comprises a lower electromagnet, a lower armature, a lower valve core and a lower valve core reset spring, the upper electromagnet and the lower electromagnet are all annular, the upper electromagnet is embedded into a counter bore at the upper end of the fourth layer valve block, the upper valve core reset spring is embedded into an upper electromagnet central hole, and two ends of the upper valve core reset spring respectively prop against the centers of the upper armature and the counter bore at the upper end of the fourth layer valve block; the upper armature iron positioned on the upper side of the upper electromagnet is embedded into a counter bore at the lower end of the third layer valve block and fixed on the lower end of the upper valve core, the upper end of the upper valve core is embedded into an upper control cavity, and the upper control cavity is positioned at the center of the upper end of the third layer valve block; the lower electromagnet is embedded into a counter bore at the lower end of the fourth-layer valve block, the lower valve core reset spring is embedded into a central hole of the lower electromagnet, and two ends of the lower valve core reset spring respectively abut against the centers of the lower armature and the counter bore at the lower end of the fourth-layer valve block; the lower armature positioned at the lower side of the lower electromagnet is embedded into a counter bore at the upper end of the fifth-layer valve block and is fixed at the upper end of the lower valve core, the lower end of the lower valve core is embedded into a lower control cavity, and the lower control cavity is positioned at the center of the lower end of the fifth-layer valve block.
Furthermore, the upper valve core and the lower valve core are of stepped shaft structures, a small end shaft of the stepped shaft of the upper valve core is fixedly connected with an upper armature at the lower side, and a large end shaft of the stepped shaft of the upper valve core is embedded into the upper control cavity; the small end shaft of the stepped shaft of the lower valve core is fixedly connected with the lower armature at the upper side, and the large end shaft of the stepped shaft of the lower valve core is embedded into the lower control cavity.
Further, the double needle valve assembly comprises an inner needle valve, an outer needle valve, an inner needle valve control cavity, an outer needle valve lower cavity, an inner needle valve reset spring and an outer needle valve reset spring, wherein the outer needle valve is embedded into a central hole of the injection valve block, the inner needle valve is embedded into the outer needle valve, a conical head at the lower end of the inner needle valve and a conical sleeve at the lower end of the outer needle valve penetrate through the lower cavity of the injection valve block and are abutted against the conical bottom of the lower cavity of the injection valve block, the conical head at the lower end of the inner needle valve seals a plurality of inner spray holes at the lower end of the injection valve block, and the conical sleeve at the lower end of the outer needle valve seals a plurality of outer spray holes at the lower end of the injection valve block; the transverse hole transversely passes through one side of the middle part of the outer needle valve and is communicated with the upper part of the lower cavity of the outer needle valve; the center post at the bottom of the sixth-layer valve block extends into the inner needle valve control cavity, and two ends of an inner needle valve reset spring positioned in the inner needle valve control cavity respectively lean against the bottom surface of the center post of the sixth-layer valve block and the top end of the inner needle valve; two ends of an outer needle valve reset spring positioned in the outer needle valve control cavity respectively lean against the bottom of the sixth layer valve block and the top end of the outer needle valve; the control oil way is connected with a high-pressure oil hole on one side of the fifth-layer valve block; the control gas circuit passes through the second layer valve block, the third layer valve block, the fourth layer valve block, the fifth layer valve block and the sixth layer valve block from the first layer valve block downwards in sequence and then is led to an outer needle valve control cavity in the center of the top end of the seventh layer valve block.
Further, the control oil way comprises an inner needle valve control cavity oil inlet orifice, an inner needle valve control cavity oil return orifice and an inner needle valve control cavity connecting oil hole which are arranged in the sixth layer valve block, one end of the inclined inner needle valve control cavity connecting oil hole is connected with the high-pressure oil hole on one side of the fifth layer valve block, and the other end of the inner needle valve control cavity connecting oil hole is connected with the upper end of the inner needle valve control cavity oil inlet orifice; the lower end of the oil inlet orifice of the inner needle valve control cavity vertically passes through the center post downwards to be communicated with the inner needle valve control cavity; the oil return orifice of the inner needle valve control cavity vertically arranged crosses the center of the sixth layer of valve block, and two ends of the oil return orifice of the needle valve control cavity are respectively communicated with the lower control cavity and the inner needle valve control cavity.
Further, the control gas path comprises a control gas hole, an outer needle valve control cavity air inlet orifice, an outer needle valve control cavity air return orifice and an upper control cavity air return orifice, wherein the control gas hole sequentially penetrates through the second layer valve block, the third layer valve block, the fourth layer valve block and the fifth layer valve block from the bottom of the first layer valve block downwards to be connected with the upper end of the outer needle valve control cavity air return orifice in the sixth layer valve block, the lower end of the outer needle valve control cavity air return orifice is communicated with the outer needle valve control cavity, and the lower end of the outer needle valve control cavity air return orifice is also connected with the middle part of the high-pressure gas hole through the outer needle valve control cavity air inlet orifice; the upper end of the control air hole is connected with an upper control cavity air return orifice leading to the top of the upper control cavity through a horizontal connecting hole.
Further, an outer guide sleeve extending vertically upwards is arranged in the center of the lower part of the lower cavity of the injection valve block, the outer circle of the outer guide sleeve is in clearance fit with the inner hole of the outer needle valve, an annular gap A is reserved between the inner hole of the outer guide sleeve and the outer circle of the inner needle valve, and the ratio of the annular gap A to the radius R of the inner hole of the outer guide sleeve is as follows: a/r=0.19 to 0.21.
A control method of a dual-fuel electric control injector comprises the following steps of respectively corresponding to different working condition modes:
a Single Fuel injection mode
The lower electromagnet is electrified, the sum of the electromagnetic force of the lower electromagnet and the hydraulic pressure of the fuel oil, which is received by the lower armature, is larger than the pretightening force of the lower valve core reset spring, the lower armature drives the lower valve core to move upwards until the top surface of the big end shaft of the lower valve core abuts against the top surface of the lower control cavity, and the lower valve core stops moving upwards; the pressure at the lower end of the lower control cavity is reduced, the lower control cavity is communicated with an oil return orifice of the inner needle valve control cavity, and the fuel oil in the inner needle valve control cavity enters the lower part of the lower control cavity through the oil return orifice of the inner needle valve control cavity, so that the fuel pressure of the inner needle valve control cavity is further reduced until the fuel pressure at the lower end of the inner needle valve is greater than the sum of the fuel pressure at the upper end of the inner needle valve and the pretightening force of an inner needle valve return spring, and the inner needle valve moves upwards until the inner needle valve return spring is compressed in place and does not move upwards; the gap between the lower end of the inner needle valve and the inner side surface of the conical bottom of the lower cavity of the injection valve block is increased, and high-pressure fuel in the lower cavity of the injection valve block is sprayed out from a plurality of inner spray holes through the gap;
b Dual Fuel injection mode
The upper electromagnet and the lower electromagnet are simultaneously electrified, at the moment, the sum of electromagnetic force born by the upper armature and gas pressure born by the upper end of the upper armature is larger than the pretightening force of the upper valve core reset spring, the upper armature drives the upper valve core to move downwards, the top surface of the large end shaft of the upper valve core is abutted against the bottom surface of the upper control cavity, and the upper valve core stops moving upwards; the pressure at the upper end of the upper control cavity is reduced, an upper control cavity air return orifice at the upper end of the upper control cavity is communicated with the control air hole through a horizontal connecting hole, and the air in the outer needle valve control cavity sequentially passes through the outer needle valve control cavity air return orifice, the control air hole, the horizontal connecting hole and the upper control cavity air return orifice to enter the upper part of the upper control cavity, so that the air pressure of the outer needle valve control cavity is further reduced until the air pressure at the lower end of the outer needle valve is greater than the sum of the air pressure at the upper end of the outer needle valve and the pretightening force of an outer needle valve return spring, and the outer needle valve is moved upwards until the outer needle valve return spring is compressed in place and does not rise any more; the high-pressure gas in the lower cavity of the injection valve block is increased through a gap between the lower end of the outer needle valve and the inner side surface of the conical bottom of the lower cavity of the injection valve block, and the high-pressure gas in the lower cavity of the injection valve block is sprayed out from a plurality of outer spray holes;
meanwhile, the process of the single fuel injection mode A is repeated after the lower electromagnet is electrified, and high-pressure fuel in the lower cavity of the injection valve block is sprayed out from a plurality of inner spray holes to complete dual-fuel injection.
The dual-fuel electric control injector has a compact structure, adopts an upper electromagnetic valve assembly and a lower electromagnetic valve assembly which are arranged vertically symmetrically, controls the on-off of fuel oil and fuel gas respectively by adopting the structures of a control oil way and a control gas way, and has a double needle valve assembly structure embedded by an outer needle valve and an inner needle valve, so that the radial dimension of the dual-fuel electric control injector is unchanged compared with that of a single-fuel injector, the dual-fuel electric control injector is suitable for being arranged on a cylinder cover of an existing diesel engine, the modification cost of the existing diesel engine for modifying the dual-fuel engine is obviously reduced, the modification efficiency is improved, two injection modes of single-fuel injection or fuel-fuel gas dual-fuel injection are realized by starting the single electromagnetic valve assembly or simultaneously starting different control methods of the two electromagnetic valve assemblies, the dual-fuel injection modes can be flexibly switched according to different working conditions of the engine, the power performance of the engine is met, and the economical performance and the emission performance of the engine are improved.
Advantages and features of the invention will be illustrated and explained by the following non-limiting description of preferred embodiments, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of section I of FIG. 1;
fig. 3 is an enlarged view of section ii of fig. 1.
Detailed Description
The invention is further described below with reference to the drawings and examples.
In the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like, which indicate an orientation or a positional relationship, are based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the device in question must have a particular orientation.
As shown in fig. 1, the present embodiment includes an upper cap 1, a lower case 2 and 7-layer valve block 3, and an upper solenoid valve assembly 4, a lower solenoid valve assembly 5, a double needle valve assembly 6, a control oil passage 7, and a control gas passage 8, 7-layer valve block 3 includes a first-layer valve block 31, a second-layer valve block 32, a third-layer valve block 33, a fourth-layer valve block 34, a fifth-layer valve block 35, a sixth-layer valve block 36, and an injection valve block 37, the upper and lower ends of the first-layer valve block 31 are respectively screwed with the lower end of the upper cap 1 and the upper end of the lower case 2, the top end of the first-layer valve block 31 abuts against the bottom surface of the upper cap screw hole 11, and the first-layer valve block 31, the second-layer valve block 32, the third-layer valve block 33, the fourth-layer valve block 34, the fifth-layer valve block 35, the sixth-layer valve block 36, and the injection valve block 37 abutting each other are sequentially embedded in the lower case 2 from top to bottom, and clearance fit with the lower case 2. The conical head 371 at the lower end of the stepped shaft-shaped injection valve block penetrates out of the lower end of the lower housing 2. The first-stage valve block 31 is provided with a fuel pressure accumulation chamber 311 and a fuel pressure accumulation chamber 312 which are arranged side by side and open at the top, and high-pressure fuel oil of 16 to 22Mpa enters the fuel pressure accumulation chamber 311 of the first-stage valve block 31 through the high-pressure fuel input joint 12 and the high-pressure fuel input hole 13 at the left side of the top end of the upper tightening cap 1, respectively. The high-pressure gas with the pressure of 12-15 Mpa enters the gas pressure accumulating cavity 312 of the first-layer valve block 31 through the high-pressure gas input joint 14 and the high-pressure gas input hole 15 on the right side of the top end of the upper fastening cap 1. The top surfaces of the second layer valve block 32, the third layer valve block 33, the fourth layer valve block 34, the fifth layer valve block 35 and the sixth layer valve block 36, and the nozzle valve block 37 are respectively embedded with sealing rings 38 to prevent the fuel oil and the fuel gas from overflowing.
As shown in fig. 1 and 2, the upper solenoid valve assembly 4 is disposed in the third and fourth layer valve blocks 33 and 34, and the lower solenoid valve assembly 5 is disposed in the fourth and fifth layer valve blocks 34 and 35.
The upper electromagnetic valve assembly 4 and the lower electromagnetic valve assembly 5 are arranged symmetrically up and down in the same structure, the upper electromagnetic valve assembly 4 comprises an upper electromagnet 41, an upper armature 42, an upper valve core 43 and an upper valve core reset spring 44, the lower electromagnetic valve assembly 5 comprises a lower electromagnet 51, a lower armature 52, a lower valve core 53 and a lower valve core reset spring 54, the upper electromagnet 41 and the lower electromagnet 51 are all annular, the upper electromagnet 41 is embedded into a counter bore 341 at the upper end of the fourth-layer valve block, the upper valve core reset spring 44 is embedded into a central hole 411 of the upper electromagnet, and two ends of the upper valve core reset spring 44 respectively prop against the centers of the upper armature 42 and the counter bore 341 at the upper end of the fourth-layer valve block. An upper armature 42 positioned on the upper side of the upper electromagnet 41 is embedded in a counter bore 331 at the lower end of the third layer valve block and fixed on the lower end of the upper valve core 43, the upper end of the upper valve core 43 is embedded in an upper control cavity 332, and the upper control cavity 332 is positioned at the center of the upper end of the third layer valve block 33.
The lower electromagnet 51 is embedded in the counter bore 342 at the lower end of the fourth-layer valve block, the lower valve core return spring 54 is embedded in the central hole 511 of the lower electromagnet, and two ends of the lower valve core return spring 54 respectively abut against the centers of the lower armature 52 and the counter bore 342 at the lower end of the fourth-layer valve block. The lower armature 52 positioned on the lower side of the lower electromagnet 51 is embedded in the counter bore 351 at the upper end of the fifth-layer valve block and is fixed at the upper end of the lower valve core 53, the lower end of the lower valve core 53 is embedded in the lower control cavity 352, and the lower control cavity 352 is positioned at the center of the lower end of the fifth-layer valve block 35.
The upper valve core 43 and the lower valve core 53 are of a stepped shaft structure, a stepped shaft small end shaft 431 of the upper valve core 43 is fixedly connected with the upper armature 42 at the lower side, and a stepped shaft large end shaft 432 of the upper valve core 43 is embedded into the upper control cavity 332. The stepped shaft small end shaft 53 of the lower spool 53 is fixedly connected with the lower armature 52 on the upper side, and the stepped shaft large end shaft 531 of the lower spool 53 is embedded in the lower control chamber 352.
As shown in fig. 1 and 3, the double needle valve assembly 6 is embedded in the central hole 372 of the injection valve block, the lower end of the double needle valve assembly 6 passes through the lower cavity 373 of the injection valve block, abuts against the inner side surface of the conical bottom 374 of the lower cavity of the injection valve block, and seals the inner spray holes 376 and the outer spray holes 377 of the conical head 371 of the lower end of the injection valve block, and the inner spray holes 376 and the outer spray holes 377 are respectively communicated with the lower cavity 373 of the injection valve block. The bottom of the fuel oil pressure accumulation cavity 311 is communicated with the transverse hole 622 on the outer side of the double needle valve assembly 6 through the high-pressure fuel holes 9 which sequentially penetrate through the first layer valve block 31 to the left side of the injection valve block 37 from top to bottom. The bottom of the gas pressure accumulation cavity 312 is communicated with the injection valve block lower cavity 373 through high-pressure gas holes 10 which sequentially pass through the first layer valve block 31 to the injection valve block 37 from top to bottom and are arranged on the right side of the seven layers of valve blocks.
The double needle valve assembly 6 comprises an inner needle valve 61, an outer needle valve 62, an inner needle valve control cavity 63, an outer needle valve control cavity 64, an outer needle valve lower cavity 65, an inner needle valve return spring 66 and an outer needle valve return spring 67, the outer needle valve 62 is embedded in an injection valve block central hole 372, the inner needle valve 61 is embedded in the outer needle valve 62, an inner needle valve lower end conical head 611 and an outer needle valve lower end conical sleeve 623 penetrate through the injection valve block lower cavity 373 and are abutted against the conical bottom of the injection valve block lower cavity 373, the inner needle valve lower end conical head 611 seals a plurality of inner spray holes 376 at the lower end of the injection valve block 37, and the outer needle valve lower end conical sleeve 623 seals a plurality of outer spray holes 377 at the lower end of the injection valve block 37. The transverse hole 622 is communicated with the upper part of the outer needle lower chamber 65 by traversing the left side of the middle part of the outer needle 62, so that the high-pressure fuel in the fuel pressure accumulation cavity 311 is conveniently conveyed into the outer needle lower chamber 65 through the high-pressure fuel hole 9. The center post 361 at the bottom of the sixth-layer valve block 36 extends into the inner needle valve control chamber 63, and both ends of the inner needle valve return spring 66 located in the inner needle valve control chamber 63 respectively abut against the bottom surface of the center post 361 of the sixth-layer valve block 36 and the top end of the inner needle valve 61. The outer needle return spring 65 in the outer needle control chamber 64 abuts against the bottom of the sixth layer valve block 36 and the top of the outer needle 62 at both ends, respectively.
The control oil passage 7 is provided in the sixth-layer valve block 36 and the injection valve block 37, and is connected to the high-pressure oil hole 9 on the left side of the fifth-layer valve block 35. The control oil path 7 comprises an inner needle valve control cavity oil inlet orifice 71, an inner needle valve control cavity oil return orifice 72 and an inner needle valve control cavity connecting oil hole 73 which are arranged in the sixth layer valve block 36, the upper end of the inclined inner needle valve control cavity connecting oil hole 73 is connected with the high-pressure oil hole 9 on one side of the fifth layer valve block 35, the lower end of the inclined inner needle valve control cavity connecting oil hole is connected with the upper end of the inner needle valve control cavity oil inlet orifice 71, and the lower end of the inner needle valve control cavity oil inlet orifice 71 vertically passes through the center column 361 downwards to be led to the inner needle valve control cavity 63. The vertically arranged inner needle valve control chamber oil return orifice 72 traverses the center of the sixth layer valve block 36, and both ends of the needle valve control chamber oil return orifice 72 communicate with the lower control chamber 352 and the inner needle valve control chamber 63, respectively.
As shown in fig. 3, the center of the lower part of the injection valve block lower cavity 373 is provided with an outer guide sleeve 375 extending vertically upwards, the outer circle of the outer guide sleeve 375 is in clearance fit with the inner hole 621 of the outer needle valve, an annular gap a is reserved between the inner hole of the outer guide sleeve 375 and the outer circle of the inner needle valve 61, and in this embodiment, the ratio of the annular gap a to the radius R of the inner hole of the outer guide sleeve: a/r=0.20. The annular gap A can also play a role in throttling and damping high-pressure fuel entering and exiting the bottom of the inner needle valve 61, so that the inner needle valve 61 is opened and closed more stably. The outer guide sleeve 375 improves the lifting stability of the outer needle valve 62, so that the conical sleeve 623 at the lower end of the outer needle valve can completely block a plurality of outer spray holes 377 when falling, and improves the opening and closing reliability of the invention.
The control air path 8 is arranged on the right side of the seven layers of valve blocks from the first layer of valve block 31 to the injection valve block 37, and the control air path 8 passes through the second layer of valve block 32, the third layer of valve block 33, the fourth layer of valve block 34, the fifth layer of valve block 35 and the sixth layer of valve block 36 from the bottom of the first layer of valve block 31 downwards in sequence and then is led to the outer needle valve control cavity 67 in the center of the top end of the seventh layer of valve block. The control gas circuit 8 comprises a control gas hole 81, an outer needle valve control cavity air inlet orifice 82, an outer needle valve control cavity air return orifice 83 and an upper control cavity air return orifice 84, the bottom of the control gas hole 8 is connected with the upper end of the outer needle valve control cavity air return orifice 83 in the sixth-layer valve block 36, the lower end of the outer needle valve control cavity air return orifice 83 is led to the outer needle valve control cavity 64, and the lower end of the outer needle valve control cavity air return orifice 83 is also connected with the middle part of the high-pressure gas hole 9 through the outer needle valve control cavity air inlet orifice 82; the upper end of the control air hole 81 is connected with an upper control chamber return air orifice 84 leading to the top of the upper control chamber 322 through a horizontal connecting hole 85.
A control method of a dual-fuel electric control injector comprises the following steps of respectively corresponding to different working condition modes:
a Single Fuel injection mode
The lower electromagnet is electrified 51, the sum of the electromagnetic force of the lower electromagnet 51 and the fuel oil pressure received by the lower armature 52 is larger than the pretightening force of the lower valve core reset spring 54, the lower armature 52 drives the lower valve core 53 to move upwards until the top surface of the large end shaft 532 of the lower valve core abuts against the top surface of the lower control cavity 352, and the lower valve core 53 stops moving upwards. The lower end pressure of the lower control chamber 352 is reduced, the lower control chamber 352 is communicated with the inner needle valve control chamber oil return orifice 72, and the fuel in the inner needle valve control chamber 361 enters the lower part of the lower control chamber 352 through the inner needle valve control chamber oil return orifice 72, so that the fuel pressure of the inner needle valve control chamber 63 is further reduced until the fuel pressure of the lower end of the inner needle valve 61 is greater than the sum of the fuel pressure of the upper end of the inner needle valve 61 and the pretightening force of the inner needle valve return spring 66, and the inner needle valve 61 moves upwards until the inner needle valve return spring 66 is compressed in place and does not move upwards. The clearance between the lower end of the inner needle valve 61 and the inner side surface of the injection valve block lower chamber tapered bottom 374 increases, and the high-pressure fuel in the injection valve block lower chamber 373 is ejected from the plurality of inner nozzle holes 376 through the annular clearance a.
B Dual Fuel injection mode
The upper electromagnet 41 and the lower electromagnet 51 are electrified simultaneously, at this time, the sum of the electromagnetic force received by the upper armature 42 and the gas pressure received by the upper end of the upper armature 42 is larger than the pretightening force of the upper valve core reset spring 44, the upper armature 42 drives the upper valve core 43 to move downwards, the top surface of the upper valve core big end shaft 432 abuts against the bottom surface 332 of the upper control cavity 332, and the upper valve core 43 stops moving upwards. The pressure at the upper end of the upper control chamber 332 is reduced, the upper control chamber air return orifice 84 at the upper end of the upper control chamber 332 is communicated with the control air hole 81 through the horizontal connecting hole 85, and the air in the outer needle valve control chamber 64 sequentially passes through the outer needle valve control chamber air return orifice 83, the control air hole 81, the horizontal connecting hole 85 and the upper control chamber air return orifice 84 to enter the upper part of the upper control chamber 332, so that the air pressure of the outer needle valve control chamber 64 is further reduced until the air pressure at the lower end of the outer needle valve 62 is greater than the sum of the air pressure at the upper end of the outer needle valve 62 and the pretightening force of the outer needle valve return spring 67, and the outer needle valve 62 moves upwards until the outer needle valve return spring 67 is compressed in place and does not rise. The high pressure fuel gas in the injection valve block lower chamber 373 is increased by the annular clearance between the lower end of the outer needle valve 62 and the inner side surface of the injection valve block lower chamber tapered bottom 374, and the high pressure fuel gas in the injection valve block lower chamber 373 is ejected from the plurality of outer nozzle holes 377.
Meanwhile, the process of the single fuel injection mode A is repeated after the lower electromagnet 51 is electrified, and high-pressure fuel in the lower cavity 373 of the injection valve block is sprayed out from the plurality of inner spray holes 376, so that dual-fuel injection is completed.
In addition to the above embodiments, other embodiments of the present invention are possible, and all technical solutions formed by equivalent substitution or equivalent transformation are within the scope of the present invention.

Claims (9)

1. The dual-fuel electric control injector is characterized by comprising an upper cover cap, a lower shell and a plurality of layers of valve blocks, an upper electromagnetic valve assembly, a lower electromagnetic valve assembly, a double needle valve assembly, a control oil circuit and a control gas circuit, wherein the plurality of layers of valve blocks comprise a first layer of valve block, a second layer of valve block, a third layer of valve block, a fourth layer of valve block, a fifth layer of valve block, a sixth layer of valve block and an injection valve block, the upper end and the lower end of the first layer of valve block are respectively in threaded connection with the lower end of the upper cover cap and the upper end of the lower shell, the top end of the first layer of valve block is abutted against the bottom surface of an upper cover threaded hole, and the first layer of valve block, the second layer of valve block, the third layer of valve block, the fourth layer of valve block, the fifth layer of valve block, the sixth layer of valve block and the injection valve block at the bottommost layer are sequentially embedded into the lower shell from top to bottom, and are in clearance fit with the lower shell, and a conical head at the lower end of the injection valve block penetrates out of the lower end of the lower shell; the first-layer valve block is provided with a fuel oil pressure accumulation cavity and a fuel gas pressure accumulation cavity which are arranged side by side and open at the top, high-pressure fuel oil with the oil pressure of 16-22 Mpa respectively enters the fuel oil pressure accumulation cavity of the first-layer valve block through a high-pressure fuel oil input joint and a high-pressure fuel oil input hole at one side of the top end of the upper fastening cap, and high-pressure fuel gas with the air pressure of 12-15 Mpa respectively enters the fuel gas pressure accumulation cavity of the first-layer valve block through a high-pressure fuel gas input joint and a high-pressure fuel gas input hole at the other side of the top end of the upper fastening cap; the lower end of the double needle valve component passes through the lower cavity of the injection valve block, is propped against the inner side surface of the conical bottom of the lower cavity of the injection valve block, and seals a plurality of inner spray holes and a plurality of outer spray holes of the conical head at the lower end of the injection valve block, and the plurality of inner spray holes and the plurality of outer spray holes are respectively communicated with the lower cavity of the injection valve block; the bottom of the fuel oil pressure accumulation cavity is communicated with a transverse hole at the outer side of the double needle valve assembly through a high-pressure fuel hole which sequentially passes through the first layer valve block to one side of the seven layers of valve blocks from top to bottom; the bottom of the fuel gas pressure accumulation cavity is communicated with the lower cavity of the injection valve block through high-pressure fuel holes which sequentially penetrate through the first layer valve block to the other side of the seven layers of valve blocks from top to bottom; the upper electromagnetic valve component is arranged in the third layer valve block and the fourth layer valve block, and the lower electromagnetic valve component is arranged in the fourth layer valve block and the fifth layer valve block; the control oil path is arranged in the sixth-layer valve block and the injection valve block, and the control oil path is arranged in one side of the seven-layer valve blocks from the first-layer valve block to the injection valve block.
2. The dual fuel electronically controlled injector of claim 1, wherein the second layer valve block top surface, the third layer valve block top surface, the fourth layer valve block top surface, the fifth layer valve block top surface, and the sixth layer valve block top surface, and the nozzle valve block top surface are each embedded with a sealing ring.
3. The dual-fuel electrically controlled injector of claim 1, wherein the upper solenoid valve assembly and the lower solenoid valve assembly are arranged symmetrically up and down in the same structure, the upper solenoid valve assembly comprises an upper electromagnet, an upper armature, an upper valve core and an upper valve core reset spring, the lower solenoid valve assembly comprises a lower electromagnet, a lower armature, a lower valve core and a lower valve core reset spring, the upper electromagnet and the lower electromagnet are all annular, the upper electromagnet is embedded in a counter bore at the upper end of the fourth layer valve block, the upper valve core reset spring is embedded in a central hole of the upper electromagnet, and two ends of the upper valve core reset spring respectively abut against the centers of counter bores at the upper ends of the upper armature and the fourth layer valve block; the upper armature iron positioned on the upper side of the upper electromagnet is embedded into a counter bore at the lower end of the third layer valve block and fixed on the lower end of the upper valve core, the upper end of the upper valve core is embedded into an upper control cavity, and the upper control cavity is positioned at the center of the upper end of the third layer valve block; the lower electromagnet is embedded into a counter bore at the lower end of the fourth-layer valve block, the lower valve core reset spring is embedded into a central hole of the lower electromagnet, and two ends of the lower valve core reset spring respectively abut against the centers of the lower armature and the counter bore at the lower end of the fourth-layer valve block; the lower armature positioned at the lower side of the lower electromagnet is embedded into a counter bore at the upper end of the fifth-layer valve block and is fixed at the upper end of the lower valve core, the lower end of the lower valve core is embedded into a lower control cavity, and the lower control cavity is positioned at the center of the lower end of the fifth-layer valve block.
4. The dual fuel electrically controlled injector of claim 3, wherein the upper valve core and the lower valve core are of a stepped shaft structure, a small end shaft of the stepped shaft of the upper valve core is fixedly connected with the upper armature on the lower side, and a large end shaft of the stepped shaft of the upper valve core is embedded in the upper control cavity; the small end shaft of the stepped shaft of the lower valve core is fixedly connected with the lower armature at the upper side, and the large end shaft of the stepped shaft of the lower valve core is embedded into the lower control cavity.
5. The dual fuel electronically controlled injector of claim 1, wherein the dual needle valve assembly comprises an inner needle valve, an outer needle valve, an inner needle valve control chamber, an outer needle valve lower chamber, an inner needle valve return spring and an outer needle valve return spring, wherein the outer needle valve is embedded in a central hole of the injection valve block, the inner needle valve is embedded in the outer needle valve, a conical head at the lower end of the inner needle valve and a conical sleeve at the lower end of the outer needle valve both penetrate through the lower chamber of the injection valve block and are abutted against the conical bottom of the lower chamber of the injection valve block, the conical head at the lower end of the inner needle valve seals a plurality of inner spray holes at the lower end of the injection valve block, and the conical sleeve at the lower end of the outer needle valve seals a plurality of outer spray holes at the lower end of the injection valve block; the transverse hole transversely passes through one side of the middle part of the outer needle valve and is communicated with the upper part of the lower cavity of the outer needle valve; the center post at the bottom of the sixth-layer valve block extends into the inner needle valve control cavity, and two ends of an inner needle valve reset spring positioned in the inner needle valve control cavity respectively lean against the bottom surface of the center post of the sixth-layer valve block and the top end of the inner needle valve; two ends of an outer needle valve reset spring positioned in the outer needle valve control cavity respectively lean against the bottom of the sixth layer valve block and the top end of the outer needle valve; the control oil way is connected with a high-pressure oil hole on one side of the fifth-layer valve block; the control gas circuit passes through the second layer valve block, the third layer valve block, the fourth layer valve block, the fifth layer valve block and the sixth layer valve block from the first layer valve block downwards in sequence and then is led to an outer needle valve control cavity in the center of the top end of the seventh layer valve block.
6. The dual fuel electronic control injector of claim 5, wherein the control oil path comprises an inner needle valve control cavity oil inlet orifice, an inner needle valve control cavity oil return orifice and an inner needle valve control cavity connecting oil hole which are arranged in the sixth layer valve block, one end of the inclined inner needle valve control cavity connecting oil hole is connected with the high-pressure oil hole on one side of the fifth layer valve block, and the other end of the inner needle valve control cavity connecting oil hole is connected with the upper end of the inner needle valve control cavity oil inlet orifice; the lower end of the oil inlet orifice of the inner needle valve control cavity vertically passes through the center post downwards to be communicated with the inner needle valve control cavity; the oil return orifice of the inner needle valve control cavity vertically arranged crosses the center of the sixth layer of valve block, and two ends of the oil return orifice of the needle valve control cavity are respectively communicated with the lower control cavity and the inner needle valve control cavity.
7. The dual fuel electronically controlled injector of claim 5, wherein the control air path comprises a control air hole, an outer needle valve control chamber air inlet orifice, an outer needle valve control chamber air return orifice and an upper control chamber air return orifice, the control air hole sequentially penetrates through the second layer valve block, the third layer valve block, the fourth layer valve block and the fifth layer valve block from the bottom of the first layer valve block downwards to be connected with the upper end of the outer needle valve control chamber air return orifice in the sixth layer valve block, the lower end of the outer needle valve control chamber air return orifice is communicated with the outer needle valve control chamber, and the lower end of the outer needle valve control chamber air return orifice is also connected with the middle part of the high pressure air hole through the outer needle valve control chamber air inlet orifice; the upper end of the control air hole is connected with an upper control cavity air return orifice leading to the top of the upper control cavity through a horizontal connecting hole.
8. The dual fuel electrically controlled injector of claim 5, wherein the center of the lower part of the lower cavity of the injection valve block is provided with an outer guide sleeve extending vertically upwards, the outer circle of the outer guide sleeve is in clearance fit with the inner hole of the outer needle valve, an annular gap A is reserved between the inner hole of the outer guide sleeve and the outer circle of the inner needle valve, and the ratio of the annular gap A to the radius R of the inner hole of the outer guide sleeve is as follows: a/r=0.19 to 0.21.
9. A method of controlling a dual fuel electronically controlled injector as claimed in any one of claims 1 to 8, comprising the respective steps of:
a Single Fuel injection mode
The lower electromagnet is electrified, the sum of the electromagnetic force of the lower electromagnet and the hydraulic pressure of the fuel oil, which is received by the lower armature, is larger than the pretightening force of the lower valve core reset spring, the lower armature drives the lower valve core to move upwards until the top surface of the big end shaft of the lower valve core abuts against the top surface of the lower control cavity, and the lower valve core stops moving upwards; the pressure at the lower end of the lower control cavity is reduced, the lower control cavity is communicated with an oil return orifice of the inner needle valve control cavity, and the fuel oil in the inner needle valve control cavity enters the lower part of the lower control cavity through the oil return orifice of the inner needle valve control cavity, so that the fuel pressure of the inner needle valve control cavity is further reduced until the fuel pressure at the lower end of the inner needle valve is greater than the sum of the fuel pressure at the upper end of the inner needle valve and the pretightening force of an inner needle valve return spring, and the inner needle valve moves upwards until the inner needle valve return spring is compressed in place and does not move upwards; the gap between the lower end of the inner needle valve and the inner side surface of the conical bottom of the lower cavity of the injection valve block is increased, and high-pressure fuel in the lower cavity of the injection valve block is sprayed out from a plurality of inner spray holes through the gap;
b Dual Fuel injection mode
The upper electromagnet and the lower electromagnet are simultaneously electrified, at the moment, the sum of electromagnetic force born by the upper armature and gas pressure born by the upper end of the upper armature is larger than the pretightening force of the upper valve core reset spring, the upper armature drives the upper valve core to move downwards, the top surface of the large end shaft of the upper valve core is abutted against the bottom surface of the upper control cavity, and the upper valve core stops moving upwards; the pressure at the upper end of the upper control cavity is reduced, an upper control cavity air return orifice at the upper end of the upper control cavity is communicated with the control air hole through a horizontal connecting hole, and the air in the outer needle valve control cavity sequentially passes through the outer needle valve control cavity air return orifice, the control air hole, the horizontal connecting hole and the upper control cavity air return orifice to enter the upper part of the upper control cavity, so that the air pressure of the outer needle valve control cavity is further reduced until the air pressure at the lower end of the outer needle valve is greater than the sum of the air pressure at the upper end of the outer needle valve and the pretightening force of an outer needle valve return spring, and the outer needle valve is moved upwards until the outer needle valve return spring is compressed in place and does not rise any more; the high-pressure gas in the lower cavity of the injection valve block is increased through a gap between the lower end of the outer needle valve and the inner side surface of the conical bottom of the lower cavity of the injection valve block, and the high-pressure gas in the lower cavity of the injection valve block is sprayed out from a plurality of outer spray holes;
meanwhile, the process of the single fuel injection mode A is repeated after the lower electromagnet is electrified, and high-pressure fuel in the lower cavity of the injection valve block is sprayed out from a plurality of inner spray holes to complete dual-fuel injection.
CN202310576236.9A 2023-05-22 2023-05-22 Dual-fuel electric control injector and control method Pending CN116447057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310576236.9A CN116447057A (en) 2023-05-22 2023-05-22 Dual-fuel electric control injector and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310576236.9A CN116447057A (en) 2023-05-22 2023-05-22 Dual-fuel electric control injector and control method

Publications (1)

Publication Number Publication Date
CN116447057A true CN116447057A (en) 2023-07-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310576236.9A Pending CN116447057A (en) 2023-05-22 2023-05-22 Dual-fuel electric control injector and control method

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Country Link
CN (1) CN116447057A (en)

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